5"x7" Needlework Cards are tri-fold. (Design opening is 3" x 5") This means that the card folds over to cover the back of the needlework, and then folds a second time to form the card. Use a glue stick or small amount of white craft glue to finsih (if you use too much water base glue, the paper may absorb the water and ripple.) Stitchery Tape works great on the cards as well. Cards come in packs of 5 (5 cards/5 white envelopes). Cards come in 5 color choices, make your selection using the drop down box.